I find very convenient to edit a CSS from Chrome, and then saving my edits directly.
But then I need a way to take this changes back to SASS by hand, and I think that may be there is a tool to do this more easily.
I understand that it is difficult to have a tool that automatically does that, but may be there is some tool that can at least do a comparison between the SASS file and the CSS file (like a diff) and let me see the SASS in the right pane and the CSS in the left pane, in a synchronized view ?
Sass Sleuth is a tool that will solve this problem for you.
Alternatively you could use FireSass for Firefox, or Sass Inspector for Chrome.